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Is this what you had in mind: https://cache.industry.siemens.com/dl/files/817/109756817/att_1087944/v1/scc_b.pdf

It appears to be a very convoluted solution to send signals from a Compact Logix PLC through another PLC to drive a valve {if that is understood correctly}. On the assumption that the valve has to fully open or fully close {that is, not stop halfway}; then you appear to have a software fault...

You’re correct, but interesting as a summary. Try euautomation.com/uk/schleicher

https://www.expo21xx.com/automation21xx/13463_st3_it-automation/13463_st3_control-equipment_old/default.htm We don't have this software but as the link suggests : " Excellent Price and Performance"

https://www.edata.omron.com.au/eData/Software/Windows/Syswin%20V3_4%20Operation%20Manual.pdf Section 4.1 gives the impression there is a 'CPU Area' but totally unclear how useful this is; otherwise there very little on error messages.

https://control.com/technical-articles/going-gray/

If you have done a quotation - sometimes it's good to take a step backand look at the alternatives. There is nothing worse than seeing cable held up by tie-wraps, inside or out. It protects cable from weather externally and from atmosphere indoors. Conduit allows several cable to run tidyly...

You appear to be overthinking a crossover point in Legislation whlist pointing into a grey area. Having seen manufacturers make both enclosure and switchgear installation, compliance is no problem. Where enclosures are bought in, compliance to IEC 62208 is at point of purchase. Fitting out...

The simple answer is a pair of current amplifiers.. You may wish to check other details as to what type of amplifiers are required; in particular response time - Some time ago Siemens specifically designed a ‘moulding injection‘ card for machine control as PLC / analogue card response times...

You might say the input power is higher than the output power. If it's the other way round then we would ask what law of physics is involved.. Since electrical power is a function of voltage and currents, we can assume your input/output voltages are different; and since there is a large variety...

"Bench testing or bench setup of a 2-wire valve positioner requires the use of a 4-20mA loop simulator or loop calibrator to power the valve positioner and provide an input signal" In fact it's much easier to test a pressure sensor or any other instrument using a 4-20mA loop calibrated source...

What software instructions have you programmed to initiate comms. with your external device. A few more details on configuration and the external device(s) may be helpful.

It's not clear what you are looking for - an electrician / engineer would isolate then separate the batteries for replacement. Since there may be high voltages involved (over 50vDC) then your industry / client may require an approved Method Statement or similar to ensure the work is undertaken...

These look like CAD created logic diagrams, maybe if the screenshot panned down there would be a drawing number and drawing title. We used to create them in the 1980/90's.

I can't see any reason why you cannot power the Carel with 24vDC and digital inputs with 24vAC. There is perhaps a degree of separation of the 2 supplies, maybe with distinct differences in wire colours. Perhaps you could increase psu up to 26vDC as a compromise with the supply being a nominal...

If you are using a Carel controller; https://www.carel.com/documents/10191/0/%2B030220336/a4fdd170-f2a3-4347-a34a-25fe018a9f75?version=1.0 then you may as well stick with 24vAC since it is clearly designed to be powered by 24vAC and have digital inputs operate with it. However at some point...

It's not clear what help you need - DOS is 25years old and Modicon software probably obsolete. Link below suggests there having memory failures: https://control.com/forums/threads/help-aeg-modicon-a020-plc.18844/

Two out of three voting (2oo3) is a typical setup for instrumentation or control system where very high integrity is required - so as part of the design of any system we try to determine whether such systems can be fault tolerant or determine circumstances where it can fail to danger {Or...

OK I've managed to work out the solution without using intermediate flags, which is not too difficult for 2bit binary numbers; mindful the above description is hard to comprehend. However for 4bit binary numbers and higher (8bit), intermediate flag usage as I asserted above is more practical...

This is where the study of Lightning protection becomes useful. Fortunately direct lighting strikes even on high ground is very rare; it is the summer storms that create cloud to cloud lightning strikes that are completely silent set the scene for Corona discharge. Once a field instrument is...